Morphology and Chromosome Number of Lab Lae Native Langsat (<I>Lansium domesticum</I> Correa)

Abstract

Local langsats from three Tambons (Fai Luang, Na Nok Kok and Mae Poon) in Lab Lae District, Uttaradit Province, were morphologically studied. It was found that the plants were of tree typed. The bark was smooth and brownish green in colour. The leaves were odd-pinnate compound. The leaf shape was lanceolate with acuminate tip, oblique base, and undulate margin. The spikes were borne in clusters, 15 – 20 centimeters in length. The flower was perfect having the floral formula of K₍₅₎ C₍₅₎ A₁₀G₍₅₎.  The fruits of eliptic shape clustered densely on each peduncle.  The fruits were oval, having thin pale yellow skin. There were 1 – 2  large seeds per fruit.  The pulp was translucent. Somatic chromosome number was
2n = 24.